IEC PAS 62408:2005

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IEC
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PAS 62408
SPECIFICATION
First edition
2005-06
Real-time Ethernet Powerlink (EPL)

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IEC/PAS 62408:2005(E)
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PUBLICLY
IEC
AVAILABLE
PAS 62408
SPECIFICATION
First edition
2005-06
Real-time Ethernet Powerlink (EPL)

© IEC 2005 – Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
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International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – PAS 62408 © IEC:2005 (E)

CONTENT
FOREWORD . 14

1 General . 15

1.1 Scope and general description . 15

1.1.1 Slot Communication Network Management (SCNM) . 15

1.1.2 EPL key features. 16
1.1.3 Integration .17
1.1.4 Modular Machines. 18

1.2 Normative references. 19

1.3 Definitions and Abbreviations . 20

1.3.1 Definitions .20
1.3.2 Abbreviations . 23
2 Modelling. 24
2.1 Reference Model. 24
2.1.1 Application Layer . 24
2.1.1.1 Service Primitives . 25
2.1.1.2 Application Layer Service Types . 25
2.2 Device Model . 26
2.2.1 General .26
2.2.2 The Object Dictionary . 27
2.2.2.1 Index and Sub-Index Usage . 28
2.3 Communication Model . 28
2.3.1 Master/Slave relationship . 28
2.3.2 Client/Server relationship. 29
2.3.3 Producer/Consumer relationship - Push/Pull model. 30
2.3.4 Superimposing of Communication Relationships . 30
3 Physical Layer. 31
3.1 Topology . 31
3.1.1 Hubs. 31
3.1.2 Switches.31
3.2 Network Guidelines. 31
3.3 Connectors.32
3.3.1 RJ-45 . 32
3.3.2 M12 . 32
3.3.3 Cross Over Pin Assignment. 33
3.3.3.1 RJ45 to RJ45 . 33
3.3.3.2 M12 to M12. 34
3.3.3.3 M12 to RJ45. 34
3.4 Cables (recommendation). 34
4 Data Link Layer.35

4.1 Modes of Operation . 35
4.2 EPL Mode . 35
4.2.1 Introduction . 35
4.2.2 EPL Nodes. 35
4.2.2.1 EPL Managing Node. 35
4.2.2.2 EPL Controlled Node . 36
4.2.2.2.1 Isochronous CN . 36
4.2.2.2.2 Async-only CN . 36
4.2.3 Services .36
4.2.4 EPL Cycle . 36
4.2.4.1 Isochronous EPL Cycle . 36
4.2.4.1.1 Start period . 37
4.2.4.1.2 Isochronous period . 37
4.2.4.1.2.1 Multiplexed Timeslots . 38
4.2.4.1.3 Asynchronous period. 38
4.2.4.1.3.1 Asynchronous Scheduling . 39

PAS 62408 © IEC:2005 (E) – 3 –

4.2.4.1.3.2 Asynchronous Transmit Priorities. 40

4.2.4.1.3.3 Distribution of the Asynchronous period. 40

4.2.4.1.4 Idle Period. 40

4.2.4.2 Reduced EPL Cycle. 40

4.2.4.3 EPL CN Cycle State Machine. 41
4.2.4.3.1 Overview. 41
4.2.4.3.2 States. 41
4.2.4.3.3 Events. 41

4.2.4.3.4 Usage of the the NMT_CS state by the DLL_CS . 42

4.2.4.3.4.1 State NMT_CS_OPERATIONAL, NMT_CS_PRE_OPERATIONAL_2,

NMT_CS_READY_TO_OPERATE . 42

4.2.4.3.4.1.1 Transitions . 43

4.2.4.3.4.2 Other States. 44

4.2.4.3.4.2.1 Transitions in other NMT states. 45
4.2.4.4 EPL MN Cycle State Machine . 45
4.2.4.4.1 Overview. 45
4.2.4.4.2 States. 45
4.2.4.4.3 Events. 45
4.2.4.4.4 Usage of the NMT_MS state by the DLL_MS . 46
4.2.4.4.4.1 State NMT_MS_OPERATIONAL . 46
4.2.4.4.4.1.1 Transitions . 48
4.2.4.4.4.2 Other Modes . 49
4.2.5 Recognizing Active Nodes. 49
4.3 Basic Ethernet Mode. 49
4.4 MAC Adressing . 50
4.4.1 MAC Unicast. 50
4.4.2 MAC Multicast. 50
4.4.3 MAC Broadcast. 50
4.5 EPL Addressing . 50
4.6 Frame Structures . 51
4.6.1 Integration with Ethernet. 51
4.6.1.1 EPL Frame. 51
4.6.1.1.1 EPL Basic Frame. 51
4.6.1.1.2 Start Of Cyclic (SoC) . 52
4.6.1.1.3 PollRequest (PReq) .
...